Robert,

So, the solution were to always and everytime use email address that include a FQDN or set the following in Config.pm to omit the check:

$Self->{CheckMXRecord} = 0;

You were ***partially*** right. I changed the email addresses to meet the FQDN (from someaddress@localhost to someaddress@my.full.qualified.domain.name.com) and everything is working fine now. However, some comments to illustrate my particular situation. I hope these will be of help in any future situations similar to mine. (1) My FQDN was already my.full.qualified.domain.name.com, not localhost (2) My CheckMXRecord was ALREADY set to 0 (I did that at least 5 emails ago, when my SMTP mail didn't work, remember?) (3) Email was working in every other case (for instance, a phone followup or when "I forgot my password"). So it seems that either CheckMXRecord is [not] used only sometimes or that the actual check is made between the FQDN and the email addresses. Well, THANK YOU VERY MUCH!!! OTRS is now fully working on my company. It will be on duty next monday. THANKS AGAIN. Jose. P.S.: Just a stupid question, easy to answer; what are the meanings of the ticket states? Sometimes a single word or a small number of these are not enough to transmit the semanthics behind them. Here's my guess: new | A newly created ticket. Nothing has been done with it yet but sent by first time to the admin. open | The ticket is being processed. Some actions has been taken. closed successfully | Obvious (at least for me). closed unsuccessfully | Again, seems to be clear for me. pending auto close - | ?????? No guess!!! pending auto close + | ?????? No guess!!! pending reminder | ?????? No guess!!! removed | Removed from the database??? I suppose that the various "pending something else" states indicate that the ticket has been acknowledged by the administrator of the queue but he/she cannot devote any efforts by now because of whatever reasons he/she has. What really puzzles me is the "auto close +" "auto close -" and "reminder" tags. Can you just send me a few words about the meaning you gave to these states? Thanks alot and again. José.